Relief-valve for force-pumps



(No Model.)

W. WASOHBR. RELIEF VALVE FOR EoEoE PUMPS.

NO.. 595,006. Patented 1360.7, 1897.

wwmeoaw UNrTnn STATES PATENT OFFICE.

\VILLIAMIVASOHER, OF PORTLAND, OREGON.

RELIEF-VALVE FOR FORCE-PUMPS.

SPECIFICATION forming part of Letters Patent No. 595,006, dated December 7, 1897.

Application filed May 19, 1897. Serial No. 637,264. (No model.)

To all whom, it may concern:

Be it known that 1, "WILLIAM WAsoHER, a citizen of the United States, residing at Portland, in the county of Multnomah, State of Oregon, have invented a certain new and useful Improvement in Relief-Valves for Force- Puinps, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to improvements in relief-valves, as those connected with the forcepumps on fire-engines. These relief-valves have the purpose to prevent by their functions the frequent bursting of the water-conducting hose when the nozzle of said hose is shut off suddenly. I attain these objects by constructing a valve as shown in the accompanying drawings, in which Figure 1 is a sectional view of the valve, and Fig. 2 is a cross-section through line 00 y.

Similarletters refer to similar parts throughout the views.

The valve-body V, which is secured to the pump at a, consists in the main of three sections screwed together and has two chambers O and O. In the lower chamber 0 the plunger 12 moves, and the upper chamber 0 is closed by the adjustable cap R and houses the spring S, whereby the resistance of plunger 10, according to the existing pressure,can be regulated. This regulation is performed by raising or lowering, as it may become necessary, the cap R, which is screwed onto the upper chamber O and which closes the valve-body V.

If the valve is to be put into operation, the shut-off cock K, which is placed over the inlet a, is opened, allowing the Water, when the nozzle on the water-hose is suddenly closed, to enter the lower part of chamber G, forcing by its pressure the plunger-head p to rise above the outlet 0 and letting the water escape through the outlet-pipe O, and through it either into the suction or on the ground, by which means the pressure in the water-hose is diminished and the bursting prevented.

By making the outlet 0 of the same size of inlet a all the water entering the valve can escape through the outlet-pipe O as quick as it entered.

The plunger 3, which is provided with lower rod p and the upper rod 19 is held in position by the guiding-rings d and d. The lower guiding-ring d is sufficiently open to allow an easy access of the water, so as to press against the plunger-head p and to hold the plungerrod 19 in place, whereas the plunger-rod p is held in place by guiding-ring d when the top of p bears the spring-seat S The spring S, which is housed in and kept in place by the walls of chamber 0 and cap R, is of sufficient strength to prevent the plunger 19 from rising farther than desired, and the tension of the spring S is regulated by the raising or lowering of cap R on its screw-threads B. To facilitate the handling of cap R, the outside of the same is provided with two or more finger-knobs f.

I am aware that prior to my invention relief-valves have been in use for the purpose of preventing the bursting of the water or fire hose. I therefore do not claim such a combination broadly; but

WVhat I do claim as my invention, and desire to secure by Letters Patent, is-

In a re1ief-va1ve, the body V having one end threaded externally and its other end internally and provided with an outlet 0 and guide-ring d, the cap R internally threaded and screwed on the body V, and the inletsection provided with cock K, a guide-ring d, and a valve-seat formed on the end of said section in combination with the plunger p having upper and lower rods p and p and spring-seat S and a spring having one end bearing against the spring-seat and the other against the cap, substantially as described.

In testimony whereof I affix my signature, in the presence of two witnesses, this 6th day of April, 1897.

WILLIAM WASOHER. WVitnesses:

A. OHLHOFF, JOHN MONTAG. 

